mirror of
https://github.com/vector-im/element-ios.git
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149 lines
4.7 KiB
Swift
149 lines
4.7 KiB
Swift
//
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// Copyright 2020 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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@objc enum PiPAnimationType: Int {
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case enter
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case exit
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}
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@objcMembers
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class PiPAnimator: NSObject {
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private enum Constants {
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static let pipViewScale: CGFloat = 0.3
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}
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let animationDuration: TimeInterval
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let animationType: PiPAnimationType
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weak var pipViewDelegate: PiPViewDelegate?
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init(animationDuration: TimeInterval,
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animationType: PiPAnimationType,
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pipViewDelegate: PiPViewDelegate?) {
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self.animationDuration = animationDuration
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self.animationType = animationType
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self.pipViewDelegate = pipViewDelegate
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super.init()
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}
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private func enterAnimation(context: UIViewControllerContextTransitioning) {
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guard let keyWindow = UIApplication.shared.keyWindow else {
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context.completeTransition(false)
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return
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}
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guard let fromVC = context.viewController(forKey: .from) else {
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context.completeTransition(false)
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return
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}
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fromVC.willMove(toParent: nil)
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// TODO: find a way to call this at the end of animation
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context.completeTransition(true)
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fromVC.removeFromParent()
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let pipView = PiPView(frame: fromVC.view.bounds)
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pipView.contentView = fromVC.view
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pipView.delegate = pipViewDelegate
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keyWindow.addSubview(pipView)
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let transform = CGAffineTransform(scaleX: Constants.pipViewScale, y: Constants.pipViewScale)
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let targetRect = fromVC.view.bounds.applying(transform)
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let animator = UIViewPropertyAnimator(duration: animationDuration, dampingRatio: 1) {
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pipView.transform = transform
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pipView.move(in: keyWindow,
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to: .bottomLeft,
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targetSize: targetRect.size)
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}
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animator.addCompletion { (position) in
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if let pipable = fromVC as? PictureInPicturable {
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pipable.enterPiP?()
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}
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fromVC.dismiss(animated: false, completion: nil)
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}
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animator.startAnimation()
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}
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private func exitAnimation(context: UIViewControllerContextTransitioning) {
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guard let keyWindow = UIApplication.shared.keyWindow else {
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context.completeTransition(false)
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return
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}
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guard let toVC = context.viewController(forKey: .to),
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let snapshot = toVC.view.snapshotView(afterScreenUpdates: true) else {
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context.completeTransition(false)
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return
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}
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guard let pipView = toVC.view.superview as? PiPView else {
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return
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}
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context.containerView.addSubview(toVC.view)
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context.containerView.addSubview(snapshot)
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toVC.view.isHidden = true
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toVC.additionalSafeAreaInsets = keyWindow.safeAreaInsets
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pipView.contentView = nil
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pipView.removeFromSuperview()
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snapshot.frame = pipView.frame
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let animator = UIViewPropertyAnimator(duration: animationDuration, dampingRatio: 1) {
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snapshot.frame = context.finalFrame(for: toVC)
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}
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animator.addCompletion { (position) in
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toVC.additionalSafeAreaInsets = .zero
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toVC.view.isHidden = false
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snapshot.removeFromSuperview()
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if let pipable = toVC as? PictureInPicturable {
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pipable.exitPiP?()
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}
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context.completeTransition(!context.transitionWasCancelled)
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}
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animator.startAnimation()
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}
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}
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extension PiPAnimator: UIViewControllerAnimatedTransitioning {
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func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
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return animationDuration
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}
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func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
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switch animationType {
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case .enter:
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enterAnimation(context: transitionContext)
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case .exit:
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exitAnimation(context: transitionContext)
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}
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}
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}
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